San-ha and Ju-won finally confirm their feelings for one another. However, they soon become worried about how to break the news to their family and friends. Meanwhile, Hae-jun tries to pay back Jung-jae for everything he has done for him, but some misunderstandings develop as Hae-jun's source of money is revealed.

Hae-jun finds out that San-ha is struggling with insomnia and taking medication. So-hee comes to visit San-ha alone without telling Jung-hee and asks him to stay with her and Jung-hee. Dal keeps trying to hide her feelings for Hae-jun. Meanwhile, a big secret between Ju-won and San-ha is about to be revealed by none other than Hae-jun.

Hae-jun is filled with a deep sense of betrayal as he watches San-ha and Ju-won on the verge of kissing, struggling to understand how Ju-won could accept San-ha as a boyfriend. He's haunted by the fear that, like everyone else before them, they too will eventually leave him. Meanwhile, though he knows where his mother is, Hae-jun watches her from a distance, and each glimpse only fuels his growing hatred for her.